Draft-regulator.



A. J. MARSCHALL. DRAFT REGULATOR. APPLICATION FILED JULY 12, 1912.

1,109,852, Patented Sept. 8, 1914 ADOLF J. MARSCHALL, OF MADISON, WISCONSIN.

DRAFT-REGULATOR.

Specification of Letters Patent.

Patented Sept. 8, 1914.

Application filed July 12, 1912. Serial No. 708,974.

To all whom it may concern:

Be it known that. I, ADOLF J. MARsoHapL,

a citizen of the United States, residing'at Madison, in the county of Dane and State of Wisconsin, have invented a new and useful Improvement in Draft-Regulators, of

. slve materials may be used for this purpose.

which the-following is a specification. This invention relates to draft regulators and more particularly to that class of draft regulators which are used for automatically controlling check dampers in flue pipes.

The object of this invention is to provide a simple automatic regulator for the flue damperwhich can be .readily placed in operative-position in flues of usual construction and which will effectually operate in connection with the ordinary chain and hand flue dampers to regulate the movement of these dampers and can be easily removed from the flue whenever it is desired to clear or repair the same.

In the accompanying drawings: Figure 1 is a sectional elevation of a flue provided with a draft regulator embodying the invention. Fig. 2 is a sectional plan view thereof. Fig. 3 is a fragmentary plan view of the adjustable attachment for the base of the regulator. Fig. 4 is a fragmentary sectional elevation of a flue provided with a regulator of a modified construction.

Like reference characters refer to like parts in the several figures.

A represents a flue pipe of the usual con struction employed for conveying the hot gases and. smoke from the stove or furnace to the chimney. B the usual hinged check damper which is arranged in and closes the end of the flue and has a handle 0 or chain or other connection by which it can be 45. which rests on the bottom wall of the flue,

and at its opposite end is adapted to engage the inner face of the damper B. 1 v

The thermostatic bar D is composed of two metal strips (1 (l' which are formed of materials having different coeflicients of exunequally under the influence of heat. -the.construct1on shown, the strip (Z is of brass and the strip cl of iron as these two pansion so that the two strips will expand metals differ considerably in their coefficients of expans1on, but any other suitable expan The strips 03 d are riveted or otherwise suitably secured together and may be so arranged as to give the thermostatic bar D any predetermined normal position, and in the present construction this bar is shown as belng substantially straight. Under the action of l1eat, the brass strip 01 will expand more rapidly than the iron strip 03 and this.

will cause the bar to curve upwardly as shown in dotted lines in Fig. 1.

The base E for the thermostatic bar may be of any suitable construction adapted to be inserted into the flue and to rest on the bottom wall thereof. The base shown in Figs. 1 and 2 comprises an inclined bar which rests at its lower end on the bottom wall of the flue adjacent to the open end thereof, and is provided intermediate of its ends with an arched support 6 which extends transversely of the base with its ends resting upon the bottom wall of the flue at opposite sides thereof. This arched support prevents the base from tipping in the flue and thus holds the regulator upright therein.

The upper end of the base E is preferably provided with an attaching portion 6 to Between the free end of the thermostatic bar .and the inner face of the damper, an-

anti-friction roller F is inserted which is adapted to travel over the inner face ofthe damper under the movements of the thermostatic bar. This roller may be secured to the bar in any suitable manner. In the con struction shown in Figs. 1 and 2, the roller F is journaledin one end. of a sleeve f which fits over an end extension f of the strip. (2 and is adjustably'secured thereto by'means of a set screw F. The roller can thus be adjusted relative to the damper so that the movement of the roller over the inner face of the damper under the action of, the thermostatic bar will produce the necessary regulating movement of the damper. There is no connection between the thermostatic bar and the damper so that the damper is free to move independ ently of the regulator and can thus be operated at will by hand or in any other manner Without interference on the part of the regulator and without disturbing the position of, the regulator in the flue.

When the base of the regulator is made of light material, the pressure of the damper on the regulator some times causes the regu-' lator to shift its position in the flue. To" prevent this the baseof' the regulator'm'ay be secured to the flue. Any suitable means may be employed for this purpose. In the construction shown in Figs. 1-3, a hook Gis provided which is adjustably secured to the lower end of the base by means of a slot 9 and a screw g" and is adapted to hook over the end of the flue. This hook holds the regulator from inward movement and permits the base to be adjusted relative to the damper to position'the regulator in the flue. This adjustment of the base and the adjustment of the roller on the thermostatic bar makes it possible to regulate'with m'cety the action of the thermostatic bar on the dam-' per. g

In the modified construction shown in Fig. 4, the base H and its'support h are made of much thicker and heavier material than in the construction above described so that the weight of the base will prevent it from inward movement in the flue under the ressure of the ,damper. The base is not attached to'the flue but simply rests thereon. The roller .1 is journaled directly on an end extension '5 of the thermostatic bar and is not adjustable relativethereto. This makes a somewhat cheaper construction which is satisfactory for certain classes of regulators.

The regulator is simple and inexpensive in construction and is adapted to be easily inserted into flues as commonly constructed without requiring any change or alteration therein, and when in position in the flue will operate automatically to regulate the position of the damper in accordance with the heat, while at the same time it will not in-- terfere inany way wih' the manipulation of the damper by hand or other regulating means.

I claim as my invention: I f 1. The combination with a flue having an open end, and a hinged damper for said open by changes in temperature and is arranged to engage and move said damper, said regulator being disconnected from said flue and said damper whereby it is free to be removed from the flue and the damper can be moved independently of the regulator, said base having lateral portions which bear against the flue to hold the regulator upright therein.

2.- The combination with a flue having an open end, and ahinged damper for said open end, of a thermostatic regulator which is of a ,construction adapting it to be inserted into and removed from the flue through said open I end thereof, said regulator comprising a base which rests loosely on the bottom of the flue and a thermoresponsive member which is attached at one end to said base and has a free end which is caused to move by changes in temperature and is arranged to engage and move said damper, said regulator being disconnected from said flue and said damper whereby it is free to be removed from the through saidopen end thereof, said regulator comprising a basewhich rests loosely on the bottom of the flue and a thermoresponsive member which is attached at one end to saidbase and has a free end whichis caused to move by changes in temperature and 'is arranged to engage and move said damper, said .regulator being disconnected from said flue and said damperwhereby it is free to be removed from the flue and the damper can be moved independently'of the regulator, said base having a hooked part whichengages the end of the flue and prevents movement ofsaid regulator away from saiddamp'er; 1

4. The combination with a flue having an open end, and :a hingedfdamper for said open end, ofa thermostat c regulator which is of'a construction adaptin it to be inserted into and removed om the flue through said open end thereof, sald regulator comprisin a base which rests loosely on the bottom o the flue and a thermoresponsive member which is attached at one end to said base and'has a free. end whichris caused to move by changes in temperature and'is arranged to engage andmove said damper, said regulator being disconnected from said flueand saiddamper whereby it is free to be'removed from the flue and the damper can be moved independently of the regu- Witness my hand, this 8th day of July, lator, and. a. part which is adjustably con- I 1912. nected to said base'and engages the end of ADOLF J MARSCHA LL the flue for holdin said regulator stati0nl Witnesses:

5 ary in different ad uStmentS relative to the S. H. STUART,

damper. C.R. WEIJJNER. 

